evm/core/state/state_test.go

// (c) 2020-2020, Lux Industries, Inc.
//
// This file is a derived work, based on the go-ethereum library whose original
// notices appear below.
//
// It is distributed under a license compatible with the licensing terms of the
// original code from which it is derived.
//
// Much love to the original authors for their work.
// **********
// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package state

import (
	"testing"
	"github.com/luxfi/evm/core/rawdb"
	"github.com/luxfi/evm/core/types"
	"github.com/luxfi/geth/ethdb"
	"github.com/luxfi/geth/common"
)

type stateEnv struct {
	db    ethdb.Database
	state *StateDB
}

func newStateEnv() *stateEnv {
	db := rawdb.NewMemoryDatabase()
	sdb, _ := New(types.EmptyRootHash, NewDatabase(db), nil)
	return &stateEnv{db: db, state: sdb}
}

func TestNull(t *testing.T) {
	s := newStateEnv()
	address := common.HexToAddress("0x823140710bf13990e4500136726d8b55")
	s.state.CreateAccount(address)
	//value := common.FromHex("0x823140710bf13990e4500136726d8b55")
	var value common.Hash

	s.state.SetState(address, common.Hash{}, value)
	s.state.Commit(0, false, false)

	if value := s.state.GetState(address, common.Hash{}); value != (common.Hash{}) {
		t.Errorf("expected empty current value, got %x", value)
	}
	if value := s.state.GetCommittedState(address, common.Hash{}); value != (common.Hash{}) {
		t.Errorf("expected empty committed value, got %x", value)
	}
}

func TestSnapshot(t *testing.T) {
	stateobjaddr := common.BytesToAddress([]byte("aa"))
	var storageaddr common.Hash
	data1 := common.BytesToHash([]byte{42})
	data2 := common.BytesToHash([]byte{43})
	s := newStateEnv()

	// snapshot the genesis state
	genesis := s.state.Snapshot()

	// set initial state object value
	s.state.SetState(stateobjaddr, storageaddr, data1)
	snapshot := s.state.Snapshot()

	// set a new state object value, revert it and ensure correct content
	s.state.SetState(stateobjaddr, storageaddr, data2)
	s.state.RevertToSnapshot(snapshot)

	if v := s.state.GetState(stateobjaddr, storageaddr); v != data1 {
		t.Errorf("wrong storage value %v, want %v", v, data1)
	}
	if v := s.state.GetCommittedState(stateobjaddr, storageaddr); v != (common.Hash{}) {
		t.Errorf("wrong committed storage value %v, want %v", v, common.Hash{})
	}

	// revert up to the genesis state and ensure correct content
	s.state.RevertToSnapshot(genesis)
	if v := s.state.GetState(stateobjaddr, storageaddr); v != (common.Hash{}) {
		t.Errorf("wrong storage value %v, want %v", v, common.Hash{})
	}
	if v := s.state.GetCommittedState(stateobjaddr, storageaddr); v != (common.Hash{}) {
		t.Errorf("wrong committed storage value %v, want %v", v, common.Hash{})
	}
}

func TestSnapshotEmpty(t *testing.T) {
	s := newStateEnv()
	s.state.RevertToSnapshot(s.state.Snapshot())
}